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| author | 2023-02-20 20:07:50 +0000 | |
|---|---|---|
| committer | 2023-03-22 14:33:06 +0000 | |
| commit | 18fa257ea2337b3f8dddc9ee68ac64a28853b6a6 (patch) | |
| tree | 23dd0d134559759fd93d41380559e13d19ee67ac /libs/gui/BLASTBufferQueue.cpp | |
| parent | c2286a317e15fba7025c4c6e2059821187d91da6 (diff) | |
tracefs permissions: fix throttled_rss_stat/enable on user builds
throttled_rss_stat is a synthetic event derived from kmem/rss_stat via
hitogram/trigger machinery in tracefs. The existing MAC and DAC
permissions allow us to do everything except actually enabling/disabling
the recording of the synthetic event.
userdebug builds work because we fall back onto a generic enable/disable
set_event mechanism that is debug-only.
From strace on a debuggable build:
openat(AT_FDCWD, "/sys/kernel/tracing/events/synthetic/rss_stat_throttled/enable", O_WRONLY|O_CLOEXEC) = -1 EACCES (Permission denied)
And the corresponding file permissions:
/sys/kernel/tracing/events/synthetic/rss_stat_throttled $ ls -alZ
-rw-r--r-- 1 root readtracefs u:object_r:debugfs_tracing:s0 0 2023-02-20 19:26 enable
Tested: patched onto an internal branch, flashed panther-user, collected
trace with perfetto
Bug: 270060883
Merged-In: I25dcb6d9fa60066fd59f2d1dc796baceb3b6b419
Merged-In: I6001eec487932ab1fd869231815fbf485b7370bb
Change-Id: I6001eec487932ab1fd869231815fbf485b7370bb
(cherry picked from commit 231446d0f0dce6db16ba158113c09719fa562e9e)
Diffstat (limited to 'libs/gui/BLASTBufferQueue.cpp')
0 files changed, 0 insertions, 0 deletions